Install bilibop from wheezy-backports.

It has been maintained there for a while, and in the feature/wheezy branch we
have no good reason to go on using the older Squeeze version we have in our
APT repository.

config/chroot_apt/preferences

@@ -11,6 +11,16 @@ Package: b43-fwcutter
 Pin: release o=Debian,a=unstable
 Pin-Priority: 999
 
+Explanation: override deb.tails.boum.org's Squeeze -specific package.
+Package: bilibop-common
+Pin: release o=Debian Backports,n=wheezy-backports
+Pin-Priority: 1010
+
+Explanation: override deb.tails.boum.org's Squeeze -specific package.
+Package: bilibop-udev
+Pin: release o=Debian Backports,n=wheezy-backports
+Pin-Priority: 1010
+
 Package: florence
 Pin: release o=Debian Backports,n=wheezy-backports
 Pin-Priority: 999